The investigation began March 13, when a passerby discovered the Clutters bodies in Binford Park.

Floyd County coroner Leslie Knable said she's still waiting for the complete autopsy reports before signing the Clutters' death certificates.

But she expects the cause of death will be the same for all three family members, and so will the manner of death.

"I don't mind saying I'm still confused on this one," said Knable.

It's a case unlike anything she has worked on.

Jamie Clutter, 35, and her two children, 10-year-old Brandon and 6-month-old Katelyn, were found naked and dead in a creek.

Initially, the prosecutor's office said the children drowned.

"I think we're going to have to backtrack a bit, and I don't think we're going to have a definitive cause of death on any of the three family members," said Knable. "I think the ruling will be consistent with drowning and there is no definitve test to prove an individual drowned. It's a rule-out diagnosis."

Knable said Jamie did have some cuts and bruises on her body, likely from being in the creek, but they weren't life-threatening.

As for each of the Clutter's manner of death, meaning homicide, suicide, accident or something else, Knable said, "Unless there's a big break in this case, it's going to be undetermined," said Knable.

At first, investigators said it was possible this was a murder-suicide, something they reiterated Wednesday.

Knable said she informally ran the scenario by a national drowning expert.

"She said, statistically, the chance this mother did this is almost zero. Of course there's a first time for everything," said Knable.

Jamie's husband, Michael Clutter, previously told WLKY that was just not possible, something he stands by.

"He has said he'll never accept it. He said he wants to, he uses the words, 'Clear my wife's name. I want to clear my wife's name,'" said Knable.

Knable said she speaks to Michael Clutter almost every day. He told her it's been a struggle to get any information.

"He said it's been very frustrating, very frustrating for him not to have his phone calls returned either by the Police Department or from the prosecutors office," said Knable.

As for Wednesday's grand jury announcement, Knable said she thinks a grand jury may be a little early but that if it helps the investigation in any way, she's all for it.

Prosecutor Keith Henderson said he wanted to convene a grand jury because he did not have any updates from police since mid-March.

New Albany Police Chief Sherri Knight told WLKY this is still an open investigation, and she called the grand jury premature.